00343nas a2200109 4500008004100000020000900041245006200050210005800112300001200170490000900182856004200191 2022 eng d anull00aHow to Build the ``Optical Inverse'' of a Multimode Fibre0 aHow to Build the Optical Inverse of a Multimode Fibre a98160260 v2022 uhttps://doi.org/10.34133/2022/981602600393nas a2200121 4500008004100000022001400041245008000055210006900135260001100204300000700215490000700222856004200229 2021 eng d a2047-753800aCompressively sampling the optical transmission matrix of a multimode fibre0 aCompressively sampling the optical transmission matrix of a mult cAPR 21 a880 v10 uhttp://drupal.isibrno.cz/en/node/343601371nas a2200121 4500008004100000022001400041245006800055210006800123300000900191490000700200520099500207856004701202 2021 eng d a2041-172300aMemory effect assisted imaging through multimode optical fibres0 aMemory effect assisted imaging through multimode optical fibres a37510 v123 a

When light propagates through opaque material, the spatial information it holds becomes scrambled, but not necessarily lost. Two classes of techniques have emerged to recover this information: methods relying on optical memory effects, and transmission matrix (TM) approaches. Here we develop a general framework describing the nature of memory effects in structures of arbitrary geometry. We show how this framework, when combined with wavefront shaping driven by feedback from a guide-star, enables estimation of the TM of any such system. This highlights that guide-star assisted imaging is possible regardless of the type of memory effect a scatterer exhibits. We apply this concept to multimode fibres (MMFs) and identify a `quasi-radial' memory effect. This allows the TM of an MMF to be approximated from only one end - an important step for micro-endoscopy. Our work broadens the applications of memory effects to a range of novel imaging and optical communication scenarios.

 uhttps://doi.org/10.1038/s41467-021-23729-101140nas a2200121 4500008004100000022001400041245006800055210006600123300000800189490000600197520075000203856006500953 2020 eng d a2296-424X00aEntropy Production in an Elementary, Light Driven Micro-Machine0 aEntropy Production in an Elementary Light Driven MicroMachine a5380 v83 a

We consider the basic, thermodynamic properties of an elementary micro-machine operating at colloidal length scales. In particular, we track and analyze the driven stochastic motion of a carefully designed micro-propeller rotating unevenly in an optical tweezers, in water. In this intermediate regime, the second law of macroscopic thermodynamics is satisfied only as an ensemble average, and individual trajectories can be temporarily associated with decreases in entropy. We show that our light driven micro-propeller satisfies an appropriate fluctuation theorem that constrains the probability with which these apparent violations of the second law occur. Implications for the development of more complex micro-machines are discussed.

 uhttps://www.frontiersin.org/article/10.3389/fphy.2020.593122
Warning: Cannot modify header information - headers already sent by (output started at /var/www/docs_drupal/includes/common.inc:2777) in /var/www/docs_drupal/includes/bootstrap.inc on line 1486
Error | Ústav přístrojové techniky

Error

Error message

Recoverable fatal error: Argument 1 passed to xmlsitemap_node_create_link() must be an instance of stdClass, boolean given, called in /var/www/docs_drupal/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module on line 28 and defined in xmlsitemap_node_create_link() (line 194 of /var/www/docs_drupal/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module).
The website encountered an unexpected error. Please try again later.